The 10 Most Exploited WordPress Vulnerabilities in 2025

Why WordPress Security Vulnerabilities Are a Critical Issue in 2025

WordPress powers 43% of the entire web. That dominance makes it the number one target for cyberattacks. In 2024, Patchstack documented over 5,900 new vulnerabilities in the WordPress ecosystem — a record. In 2025, the trend is accelerating.

At Otomy, we audit and secure dozens of WordPress sites for SMBs across France and Algeria. Here are the 10 most exploited WordPress security vulnerabilities this year, with concrete actions for each one.

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1. SQL Injection via Form Plugins

Affected plugins: WPForms (versions < 1.8.7), Forminator, certain Contact Form 7 forks.

Poorly sanitized form fields allow attackers to inject SQL queries directly into the database, extracting admin credentials, customer emails, or even WooCommerce payment data.

Immediate action:

• Update all form plugins
• Use prepared statements ($wpdb->prepare()) in any custom code
• Enable a WAF like Cloudflare or Sucuri in strict mode

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2. Stored Cross-Site Scripting (XSS) in Page Builders

Affected plugins: Elementor (versions < 3.21), Beaver Builder, WPBakery.

A stored XSS flaw lets an attacker inject persistent JavaScript through a widget field. Every visitor then executes the malicious script — cookie theft, phishing redirects, and more.

Immediate action:

• Update your page builder as soon as the patch drops
• Implement a strict Content Security Policy (CSP) in your .htaccess or via Vercel if using a headless setup
• Run regular scans with WPScan or Wordfence CLI

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3. Privilege Escalation via Membership Plugins

Affected plugins: Ultimate Member (CVE-2023-3460 still actively exploited), MemberPress, Paid Memberships Pro.

An unauthenticated user can assign themselves the administrator role by manipulating registration parameters. This is one of the most devastating WordPress security vulnerabilities.

Immediate action:

• Ensure wp_capabilities and wp_user_level are blocked in registration metadata
• Disable public registration if not needed (Settings > General)
• Monitor admin account creation with an n8n workflow connected to your Supabase database

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4. REST API Authentication Flaws

WordPress exposes /wp-json/wp/v2/users/ by default, revealing usernames. Combined with brute-force, admin access is compromised within minutes.

Immediate action:

// Block user enumeration via REST API
add_filter('rest_endpoints', function($endpoints) {
    if (isset($endpoints['/wp/v2/users'])) {
        unset($endpoints['/wp/v2/users']);
    }
    return $endpoints;
});

• Enforce 2FA with WP 2FA or Wordfence Login Security
• Limit login attempts (Limit Login Attempts Reloaded)

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5. Backdoors in Nulled Premium Themes

Cracked themes downloaded from third-party sites systematically contain PHP backdoors — files named social.png containing PHP code, eval(base64_decode(...)) patterns, and similar traps.

Immediate action:

• Never install a nulled theme — ever
• Scan your installation with Wordfence searching for eval(, base64_decode, str_rot13
• Use verified themes: GeneratePress, Kadence, Astra

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6. Unrestricted File Upload (Remote Code Execution)

Affected plugins: WP File Manager (versions < 6.9), certain portfolio plugins.

The attacker uploads a .php file disguised as an image, then executes it for full server control.

Immediate action:

• Restrict allowed MIME types in functions.php
• Add to your uploads/ folder .htaccess:

<FilesMatch "\.(php|php5|phtml)$">
    Deny from all
</FilesMatch>

• Remove WP File Manager if you're not actively using it

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7. CSRF in WooCommerce Plugins

Missing or predictable CSRF tokens allow attackers to force admins into executing actions (price changes, admin creation) through a single crafted link.

Immediate action:

• Verify all custom forms use wp_nonce_field() and wp_verify_nonce()
• Update WooCommerce and all extensions
• Audit with Burp Suite or OWASP ZAP

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8. Server-Side Request Forgery (SSRF) via Import Plugins

Plugins like All-in-One WP Migration or WP All Import allow specifying external URLs. An attacker can scan your internal network or access cloud metadata services (AWS metadata at 169.254.169.254, etc.).

Immediate action:

• Deactivate import plugins after use
• Block requests to 169.254.169.254 and private ranges at the server level
• Isolate your infrastructure with a VPC network on AWS or Scaleway

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9. PHP Object Injection

Affected plugins: legacy plugins using unserialize() on user-supplied data.

This vulnerability enables arbitrary code execution and is often chained with other flaws for maximum impact.

Immediate action:

• Replace unserialize() with json_decode() in all custom code
• Audit your plugins with PHPStan or Psalm in security mode
• Prefer plugins maintained with a bug bounty program

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10. Supply Chain Attacks via Compromised Plugin Updates

In 2025, several popular plugins were acquired by malicious entities who injected malicious code into official updates. This is the most insidious threat on the list.

Immediate action:

• Monitor plugin ownership changes (Patchstack, WPScan alerts)
• Build a monitoring pipeline with n8n that checks changelogs and plugin authors on each update
• Use Claude AI to analyze code diffs between two plugin versions

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WordPress Security Checklist 2025

Action	Priority
Update core + plugins + themes	🔴 Critical
Enable 2FA on all admin accounts	🔴 Critical
Install a WAF (Cloudflare, Sucuri)	🟠 High
Weekly scans with WPScan/Wordfence	🟠 High
Block REST API user enumeration	🟡 Medium
Audit installed plugins (owner, last update)	🟠 High
Automated off-site backups (Supabase, S3)	🔴 Critical
Real-time monitoring via n8n + Slack/Telegram alerts	🟡 Medium

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Conclusion: WordPress Security Is an Ongoing Process

WordPress security vulnerabilities are not inevitable. Every flaw listed here has a concrete solution. The real danger is inaction — a site left unupdated for three months is an open invitation.

At Otomy, we implement complete DevSecOps pipelines for WordPress sites: automated scans, supervised updates, WAF configuration, monitoring with n8n, and code audits. If your WordPress site is critical to your business, it deserves protection to match.

Need a WordPress security audit? Contact the Otomy team — we find the vulnerabilities before the hackers do.